WO2009119439A1 - 含フッ素エラストマーおよびそれを含む架橋性組成物 - Google Patents
含フッ素エラストマーおよびそれを含む架橋性組成物 Download PDFInfo
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- WO2009119439A1 WO2009119439A1 PCT/JP2009/055432 JP2009055432W WO2009119439A1 WO 2009119439 A1 WO2009119439 A1 WO 2009119439A1 JP 2009055432 W JP2009055432 W JP 2009055432W WO 2009119439 A1 WO2009119439 A1 WO 2009119439A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/186—Monomers containing fluorine with non-fluorinated comonomers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/265—Tetrafluoroethene with non-fluorinated comonomers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/32—Compounds containing nitrogen bound to oxygen
- C08K5/33—Oximes
Definitions
- the present invention relates to a tetrafluoroethylene (TFE) and propylene (Pr) based elastomer having a carboxyl group as a crosslinkable group and a crosslinkable composition containing the same.
- TFE tetrafluoroethylene
- Pr propylene
- Fluoro rubber is used in various industrial fields including the automobile industry due to its excellent heat resistance and chemical resistance. Fluoro rubber is divided into perfluoro fluoro rubber and non-perfluoro fluoro rubber. As non-perfluoro fluoro rubber, vinylidene fluoride (VdF) fluoro rubber and TFE-olefin fluoro rubber are mainly used.
- VdF vinylidene fluoride
- TFE-olefin-based fluororubber As TFE-olefin-based fluororubber, TFE-Pr-based elastomer is known, and since it is particularly excellent in resistance to amines, it is an oil sealing material in the field of automobiles and industrial machinery. It is used as
- Crosslinking of this TFE-Pr elastomer is peroxide crosslinking (Patent Document 1) or polyol crosslinking (Patent Document 2).
- the former is inferior in heat resistance of the resulting crosslinked rubber, and the latter is inferior in crosslinkability and chemical resistance. There's a problem.
- An object of the present invention is to provide a TFE-Pr elastomer and a crosslinkable composition having not only excellent amine resistance but also excellent heat resistance and chemical resistance and a low gel content.
- the present invention requires tetrafluoroethylene (TFE) units 40 to 70 mol%, propylene (Pr) units 30 to 60 mol%, carboxyl group-containing vinyl monomer units 0.1 to 2.5 mol%, Depending on vinylidene fluoride (VdF) 0-15 mol% and / or perfluoro (alkyl vinyl ether) (PAVE) 0-15 mol%, Mooney viscosity at 121 ° C. is 5-100, preferably 20-80 It relates to a certain fluorine-containing elastomer.
- TFE tetrafluoroethylene
- Pr propylene
- VdF vinylidene fluoride
- PAVE perfluoro (alkyl vinyl ether)
- the carboxyl group is derived from copolymerization of a carboxyl group-containing vinyl monomer, it is present at least in the side chain.
- the TFE-Pr elastomer of the present invention comprises TFE, Pr, a carboxyl group-containing vinyl monomer, and, if necessary, VdF or PAVE at a polymerization temperature of 10 to 50 ° C. in the presence of a peroxide and a reducing agent. Obtained by copolymerization.
- the present invention also provides (A) General formula (1): Wherein R 1 is the same or different and is —NH 2 , —NHR 2 , —OH or —SH, and R 2 is a fluorine atom or a monovalent organic group.
- crosslinking agent (A) a tetraamine-based crosslinking agent is preferable because it is particularly excellent in amine resistance.
- the fluorine-containing elastomer (B) used in the crosslinkable composition of the present invention a fluorine-containing elastomer obtained by acid coagulation of the fluorine-containing elastomer (TFE-Pr elastomer) of the present invention is used. It is preferable from the viewpoint that the viscosity can be kept low and processability can be improved, and the reactivity of the carboxyl group which is a crosslinkable group is maintained.
- the present invention further relates to a molded product obtained by imidazole crosslinking of the crosslinkable composition of the present invention.
- TFE-Pr elastomer and a crosslinkable composition that are not only excellent in amine resistance but also excellent in heat resistance and chemical resistance.
- the fluorine-containing elastomer of the present invention comprises TFE units of 40 to 70 mol%, Pr units of 30 to 60 mol%, carboxyl group-containing vinyl monomer units of 0.1 to 2.5 mol%, and optionally vinylidene fluoride.
- VdF 0-15 mol% and / or perfluoro (alkyl vinyl ether) (PAVE) 0-15 mol%.
- the TFE unit is 40 to 70 mol%, preferably 50 to 65 mol%, and Pr and elastomer properties are obtained in this range.
- the Pr unit is 30 to 60 mol%, preferably 30 to 50 mol%, and elastomeric properties can be obtained in TFE and this range.
- the carboxyl group-containing vinyl monomer unit is 0.1 to 2.5 mol%, preferably 0.5 to 2.0 mol%, and forms a crosslinked structure excellent in heat resistance and amine resistance within this range. .
- the carboxyl group-containing vinyl monomer may be a COOH group-containing monomer containing a fluorine atom.
- CF 2 CFOCF 2 CF (CF 3 ) OCF 2 CF 2 COOH
- CF 2 CFO [CF (CF 3 ) CF 2 O] 2 —CF 2 CF 2 COOH, CF 2 ⁇ CFOCF 2 CF 2 CF 2 OCF 2 CF 2 COOH, CH 2 ⁇ CH (CF 2 ) n COOH (n is an integer of 1 to 5)
- CH 2 CFCF 2 [OCF (CF 3 ) CF 2 ] m OCF (CF 3 ) COOH (m is an integer of 0 to 3).
- the VdF unit or PAVE unit which is an arbitrary unit, is up to 15 mol%, and further up to 10 mol%, and if it exceeds this, the former is not preferable in terms of amine resistance and the latter is expensive.
- the TFE-Pr elastomer of the present invention has a Mooney viscosity (121 ° C.) of 5 to 100.
- Mooney viscosity 121 ° C.
- the preferred Mooney viscosity (121 ° C.) is 10-80.
- the lower limit of the preferable Mooney viscosity (121 ° C.) is 30.
- the TFE-Pr elastomer of the present invention can be produced by a usual emulsion polymerization method. However, since the polymerization rate of TFE and Pr is relatively slow, for example, when produced by the following two-stage polymerization method (seed polymerization method) Can be manufactured efficiently.
- the specific two-stage polymerization method (I) VdF-HFP copolymer obtained by emulsion polymerization of VdF and hexafluoropropylene (HFP) or VdF, HFP and TFE, preferably in the presence of a fluorine-containing reactive emulsifier and a fluorine-containing ionic emulsifier A step of producing at least 1 ⁇ 10 14 particles or VdF-HFP-TFE copolymer particles per ml of the polymerization reaction product liquid (seed production step), and (II) at least 1 ⁇ 10 14 VdF per ml of the polymerization solvent.
- seed polymerization method VdF-HFP copolymer obtained by emulsion polymerization of VdF and hexafluoropropylene (HFP) or VdF, HFP and TFE, preferably in the presence of a fluorine-containing reactive emulsifier and a fluorine-containing ionic
- It comprises a step of emulsion polymerization of TFE, Pr, a carboxyl group-containing vinyl monomer, and, if necessary, VdF or PAVE in the presence of -HFP copolymer particles or VdF-HFP-TFE copolymer particles.
- the emulsion polymerization in the seed production step (I) is preferably started using a water-soluble radical polymerization initiator.
- a water-soluble radical polymerization initiator A conventionally well-known thing can be used as a water-soluble radical polymerization initiator. Specific examples include ammonium persulfate (APS), potassium persulfate (KPS), sodium persulfate, etc. Among these, APS and KPS are preferably used because of their good ability to generate ionic end groups. it can.
- reducing agents include sulfites such as sodium sulfite, metabisulfites such as sodium bisulfite or potassium bisulfite, pyrosulfates, and thiosulfates.
- the ionic end group may be SO 3 .
- the amount of the polymerization initiator is preferably 5 to 5000 ppm, more preferably 20 to 500 ppm of the amount of water used for the polymerization.
- the polymerization temperature may be a polymerization temperature recommended for the water-soluble radical polymerization initiator to be used, and a range of 0 to 130 ° C. is adopted.
- a polymerization temperature of 0 ° C. or higher, preferably in the range of 10 to 50 ° C.
- the polymerization pressure in the emulsion polymerization varies depending on the vapor pressure of the monomer used, and is appropriately selected according to the conditions, and is preferably from reduced pressure to 15 MPa, more preferably from 0.5 to 8 MPa.
- the seed production step (I) it is preferable to perform emulsion polymerization in the presence of a vinyl group-containing fluorine-containing reactive emulsifier and a fluorine-containing ionic emulsifier from the viewpoint of stably increasing the number of particles.
- the fluorine-containing ionic emulsifier used in the step (I) for example, the formula (2): Rf- [OCF (CF 3) CF 2] m1 - (OCF 2 CF 2 CF 2) m2 -OCF (CF 3) -COOY 1 (Wherein Rf is a perfluoroalkyl group having 1 to 6 carbon atoms; Y 1 is H, —NH 4 or an alkali metal atom; m1 is an integer of 0 to 4; m2 is an integer of 0 to 4) Is preferable from the viewpoint of good particle stabilizing effect and water solubility.
- a preferable number of seed particles per 1 ml of the polymerization reaction product liquid is 1 ⁇ 10 14 or more, and further 1 ⁇ 10 15 or more.
- the upper limit is about 2 ⁇ 10 16 pieces.
- step (II) of TFE, Pr, and a carboxyl group-containing vinyl monomer a radical polymerization initiator is used in the presence of the seed particles produced in step (I) and no emulsifier is added. Addition to perform emulsion polymerization of TFE and Pr.
- the number of seed particles per ml of polymerization solvent is preferably 1 ⁇ 10 14 or more.
- step (II) is emulsion polymerization intended to produce a high molecular weight copolymer of TFE, Pr and carboxyl group-containing vinyl monomer
- the amount of polymerization initiator used in step (II) Is preferably in the range of 0.01 to 0.5% by mass of the TFE-Pr copolymer obtained in step (II), particularly in the range of 0.05 to 0.2% by mass.
- a polymerization temperature in the range of 10 to 50 ° C. using a redox polymerization initiator in combination with a reducing agent from the viewpoint of good processability of the obtained TFE-Pr elastomer.
- the isolation (recovery) of the TFE-Pr elastomer from the reaction product liquid after polymerization is not particularly limited, but isolation by coagulation with an acid keeps the viscosity of the fluorine-containing elastomer low and allows the processing. It is preferable from the point which can improve property, and the point which maintains the reactivity of the carboxyl group which is a crosslinkable group.
- inorganic acids such as hydrochloric acid and nitric acid are preferable.
- a TFE-Pr elastomer having a cyano (CN) group as a crosslinkable group is also known, but the cyano group is easily decomposed in the polymerization step, the acid coagulation step, and the subsequent drying step. However, sufficient crosslinking points cannot be provided, which may cause problems in heat resistance.
- the crosslinkable composition of the present invention can be prepared by blending a specific crosslinker with the TFE-Pr elastomer thus isolated.
- the crosslinkable composition of the present invention is (A) General formula (1): Wherein R 1 is the same or different and is —NH 2 , —NHR 2 , —OH or —SH, and R 2 is a fluorine atom or a monovalent organic group.
- the crosslinking agent (A) containing a crosslinkable reactive group represented by the formula (1) preferably has at least one crosslinkable reactive group represented by the formula (1), more preferably 2 to 4, More preferably, it has two.
- the number of crosslinkable reactive groups represented by the formula (1) may be one, but in that case, the crosslinking reaction becomes possible by containing at least one other crosslinkable reactive group.
- any other crosslinkable reactive group is selected, but a crosslinkable reactive group having at least two amino groups is preferred from the viewpoint of heat resistance.
- the crosslinkable reactive group represented by the formula (1) has high heat resistance, the crosslinkable reactive group is preferably composed only of those represented by the formula (1).
- R 1 in the formula (1) is —NH 2 , —NHR 2 , —OH or —SH, and R 2 is a fluorine atom or a monovalent organic group.
- Examples of the monovalent organic group include, but are not limited to, an aliphatic hydrocarbon group, a phenyl group, and a benzyl group.
- a lower alkyl group having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms such as —CH 3 , —C 2 H 5 , —C 3 H 7, etc .
- —CF 3 , —C 2 F 5 — Fluorine atom-containing lower alkyl group having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms, such as CH 2 F, —CH 2 CF 3 , —CH 2 C 2 F 5 ; phenyl group; benzyl group; —C 6 F 5 , — A phenyl group or a benzyl group in which 1 to 5 hydrogen atoms are substituted with a fluorine atom such as CH 2 C 6 F 5 ; —C 6 H 5-n (CF 3 ) n , —CH 2 C
- Examples of the monovalent organic group include the same ones as described above. Among these, a phenyl group and —CH 3 are preferable from the viewpoint that heat resistance is particularly excellent and synthesis is relatively easy, and a hydrogen atom is preferable from the viewpoint of good crosslinking reactivity. .
- Examples of the compound having two crosslinkable reactive groups represented by formula (1) include, for example, formula (5): (Wherein R 1 is the same as defined above, and R 5 is —SO 2 —, —O—, —CO—, an alkylene group having 1 to 6 carbon atoms, a perfluoroalkylene group having 1 to 10 carbon atoms, Single bond, or Is a group represented by Is preferable from the viewpoint of easy synthesis.
- alkylene group having 1 to 6 carbon atoms include methylene group, ethylene group, propylene group, butylene group, pentylene group, hexylene group and the like.
- perfluoroalkylene group having 1 to 10 carbon atoms Is Etc.
- the crosslinking agent (A) is preferably a compound having a symmetric structure from the viewpoint of excellent heat resistance and good crosslinking reactivity, and a crosslinking reaction represented by the formula (1). More preferably, it is a compound having at least two groups, more preferably a compound represented by formula (5), excellent long-term heat resistance, and particularly good oxazole crosslinking reactivity. 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (generic name: bisaminophenol AF) and 3,3′-bishydroxybenzidine are more preferable.
- R 5 is the same as described above.
- R 5 are known as examples of bisdiaminophenyl compounds in JP-B-2-59177 and JP-A-8-120146.
- R 5 may be bonded to any position of the left and right benzene rings, but since synthesis is easy and the crosslinking reaction proceeds easily, the NH 2 group may be bonded to the para position. preferable.
- the formula (7) It is a compound shown by these.
- Specific examples include, but are not limited to, 2,2-bis- [3-amino-4- (N-methylamino) phenyl] hexafluoropropane, 2,2-bis- [3-amino-4- (N-ethylamino) phenyl] hexafluoropropane, 2,2-bis- [3-amino-4- (N-propylamino) phenyl] hexafluoropropane, 2,2-bis- [3-amino-4- (N-phenylamino) phenyl] hexafluoropropane, 2,2-bis- [3-amino-4- (N-perfluorophenylamino) phenyl] hexafluoropropane, 2,2-bis- [3-amino- 4- (N-benzylamino) phenyl] hexafluoropropane and the like.
- the tetraamine cross-linking agent forms a strong imidazole cross-linked ring and is excellent in amine resistance, heat resistance, chemical resistance, and mechanical strength, and is particularly balanced between heat resistance and amine resistance. A good and excellent crosslinked product can be obtained.
- the addition amount of the crosslinking agent (A) is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the TFE-Pr elastomer (B). preferable.
- the crosslinking agent (A) is less than 0.1 parts by mass, there is a tendency that practically sufficient mechanical strength, heat resistance, and chemical resistance cannot be obtained. There is a tendency to not progress.
- an inorganic substance can be added as a crosslinking accelerator.
- inorganic oxides inorganic nitrides, and carbon materials are preferable, and among them, a compound having an adsorptivity to water and alcohol, a compound having a base point, and the like are more preferable.
- Examples of the compound having an adsorptivity to water and alcohol include molecular sieves, magnesium sulfate, sodium sulfate, activated carbon, and mesoporous silica.
- molecular sieves are particularly preferable from the viewpoint of improving the crosslinking rate and resistance to compression set.
- Examples of the compound having a base point include (1) alkali metals, alkaline earth metals and oxides thereof, and (2) silica, alumina, carbon, activated carbon containing alkali metals, alkaline earth metals and oxides thereof. (3) Inorganic nitrides such as silicon nitride (Si 3 N 4 ) and AlN, and (4) silica, alumina, carbon, activated carbon and the like having amine functional groups on the surface.
- magnesium oxide aluminum oxide, sodium oxide, zinc oxide, hydrotalcite, zonotlite, wollastonite, talc, attapulgite, bentonite, zeolite, clay, pyrophyllite, and serinite.
- These compounds include Carplex # 1120 (manufactured by Degussa Japan), Carplex # 100 (manufactured by Degussa Japan), Toxeal Gu (manufactured by Tokuyama Corporation), Nip Seal ER (manufactured by Nippon Silica Industry Co., Ltd.), Nip Seal NA (Nippon Silica Industry Co., Ltd.), nip seal g300 (Nihon Silica Industry Co., Ltd.), etc. can be used.
- the amount of the inorganic substance used as the crosslinking accelerator is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, with respect to 100 parts by mass of the fluorine-containing elastomer. More preferably, it is more preferably 5 parts by mass or more. Moreover, as an upper limit, it is preferable that it is 50 mass parts or less, and it is more preferable that it is 30 mass parts or less. If the amount is less than 0.1 parts by mass, the effect of adding an inorganic substance tends to be insufficient, and if it exceeds 50 parts by mass, the hardness tends to increase and the moldability tends to be inferior.
- crosslinkable composition of the present invention particularly in a field where high purity and non-staining properties are not required, usual additives blended in the fluorine-containing elastomer composition as necessary, for example, fillers, processing aids, plasticizers. Coloring agents, stabilizers, adhesion assistants, and the like can be blended, and one or more conventional crosslinking agents and crosslinking assistants different from those described above may be blended.
- the filler examples include carbon black, talc, silicic acid, silicic acid compound, calcium carbonate, barium sulfate, clay, high styrene resin, phenol resin, and coumarone resin.
- carbon black generally used includes thermal black, bituminous coal filler, furnace black, channel black and the like.
- a bituminous coal filler is preferable from the viewpoint of resistance to compression set, and a mixture of bituminous coal filler and thermal black is preferable from the viewpoint of mechanical properties.
- the addition amount of the filler is preferably 10 to 50 parts by mass, and more preferably 15 to 45 parts by mass with respect to 100 parts by mass of the fluorine-containing elastomer.
- the mixing weight ratio is preferably 9/95 to 80/20, and preferably 30/70 to 70/30. More preferred. When it is out of the above range, deterioration in compression set resistance and reduction in compression crack resistance are observed.
- composition of the present invention can be prepared by mixing each of the above-described components using an ordinary elastomer processing machine, for example, an open roll, a Banbury mixer, a kneader or the like. In addition, it can be prepared by a method using a closed mixer.
- an ordinary elastomer processing machine for example, an open roll, a Banbury mixer, a kneader or the like.
- it can be prepared by a method using a closed mixer.
- the crosslinkable composition of the present invention preferably has a Mooney viscosity (121 ° C.) of the composition itself of 10 to 120.
- Mooney viscosity (121 ° C.) is less than 10, vulcanization tends to be insufficient, and the physical properties of the vulcanizate tend to be insufficient.
- a more preferable Mooney viscosity (121 ° C.) is 30 to 80.
- a method for obtaining a crosslinked molded product from the composition may be a conventional method, and may be performed by a known method such as a method of heat-compressing with a mold, a method of press-fitting into a heated mold, or a method of extruding with an extruder. it can.
- a crosslinked molded product can be obtained by performing heat crosslinking with steam after extrusion.
- the crosslinking conditions are not particularly limited, and can be performed under the crosslinking conditions of ordinary fluorine-containing elastomers.
- the cross-linking composition is placed in a mold and kept under pressure at 120 to 250 ° C. (preferably 180 to 250 ° C.) for 1 to 120 minutes to perform press crosslinking.
- oven crosslinking by holding in an oven at 160-320 ° C. (preferably 200-320 ° C., more preferably 230-300 ° C.) for 0-48 hours (preferably 2-48 hours)
- a cross-linked product exhibiting excellent sealing properties can be obtained.
- a rubber laminate in which a cross-linked fluorine-containing elastomer layer obtained by cross-linking the cross-linkable composition of the present invention and a non-fluorine elastomer layer formed from a non-fluorine elastomer composition may be laminated.
- This laminated body is useful as a hose as a laminated body having amine resistance, heat resistance, oil resistance, and cold resistance.
- the molded article of the present invention is useful as various molded articles in various fields, and is useful as various molded articles in the following fields. Among them, it is useful for high-temperature environments of hose materials, especially transport equipment (automobiles, etc.). Useful as hose material around exposed engines. For example, a turbocharger hose, an intercooler hose, etc. are mentioned.
- preferred fields are semiconductor manufacturing equipment, liquid crystal panel manufacturing equipment, plasma panel manufacturing equipment, plasma address liquid crystal panels, field emission display panels, semiconductor related fields such as solar cell substrates, aircraft fields, rocket fields, Ships, chemicals such as chemical plants, chemicals such as pharmaceuticals, photographic fields such as developing machines, printing fields such as printing machines, coating fields such as coating equipment, food plant equipment fields, nuclear power plant equipment fields, iron plate processing Examples include steel fields such as equipment, general industrial fields, fuel cell fields, electronic parts fields, oil field drilling equipment fields, and the like.
- Average particle size measuring device Microtrack UPA manufactured by HONEYWELL Measurement method: Dynamic light scattering method A sample obtained by diluting 0.05 ml of the emulsion to be measured with 8 ml of pure water is measured at room temperature. The number average diameter of the obtained data is defined as the particle diameter.
- Elemental analysis Measuring device THERUMO Orion 720A, fluorine ion selective electrode Measuring method: About 1.5 mg of sample is burned in oxygen gas, absorbed in 10 ml of pure water, neutralized with 10 ml of buffer solution, and fluorine ions Measure with selected electrode.
- Mooney viscosity (121 ° C) Measuring device MOONEY MV 2000E manufactured by ALPHA TECHNOLOGIES Measurement method: The apparatus is set to 121 ° C., about 35 g of a measurement sample is sandwiched between L rotors, the measurement is started after the remaining heat for 1 minute, and the value is taken 11 minutes later (10 minutes after the start).
- the resulting polymerization reaction product liquid was 1577 g and contained 7.6 ⁇ 10 14 VdF-HFP copolymer particles (average particle size 0.028 ⁇ m) per ml of the polymerization reaction product liquid (solid content 1). .5% by mass).
- the pH of this polymerization reaction product solution was 4, and the pH was adjusted to 7 by adding an aqueous sodium hydroxide solution.
- the content was 60.7% by mass, and the glass transition temperature Tg was 4 ° C. (1.8 ⁇ 10 14 ) per 1 ml of the polymerization solvent (water) (pH 7, solid content 16.6% by mass).
- the TFE / Pr / CBVE copolymer was coagulated with 10% sulfuric acid from the polymerization reaction product obtained in the step (II), washed with pure water, and then heated at 80 ° C. for 8 hours in a hot air drying furnace. Furthermore, it dried at 120 degreeC for 12 hours.
- the Mooney viscosity (121 ° C.) of the obtained TFE / Pr / CBVE copolymer was 75.
- Example 2 Step (I) In the same manner as in Example 1, 765 g of the polymerization reaction product liquid containing the VdF-HFP copolymer particles obtained in the step (I) of Example 1 was used.
- Step (II) In the step (II) of Example 1, during the polymerization of TFE and Pr, polymerization was carried out in the same manner except that 1.8 g of diethyl malonate was injected 5 times and 3.74 g of CBVE was injected 18 times, 323 minutes after the start of the polymerization, the residual gas was discharged when the amount of the additional monomer mixture was 231 g to complete the polymerization.
- the content was 60.7% by mass, and the glass transition temperature Tg was 4 ° C. (1.6 ⁇ 10 14 ) per 1 ml of the polymerization solvent (water) (pH 7, solid content 16.6% by mass).
- the TFE / Pr / CBVE copolymer was coagulated with 10% nitric acid from the polymerization reaction product obtained in step (II), washed with pure water, and then heated at 80 ° C. for 8 hours in a hot air drying furnace. Furthermore, it dried at 120 degreeC for 12 hours.
- the Mooney viscosity (121 ° C.) of the obtained TFE / Pr / CBVE copolymer was 41.
- Example 3 100 parts by mass of the TFE / Pr / CBVE copolymer obtained in Example 1, 20 parts by mass of N990 (Thermax MT (manufactured by Cancarb)) as carbon black, and 2,2-bis (3,3) as a tetraamine-based crosslinking agent 1.75 parts by mass of 4-diaminophenyl) hexafluoropropane (crosslinking agent TA-AF) was kneaded with an open roll to obtain a crosslinking composition. When the vulcanization characteristics of this composition were examined, the induction time (T 10 ) was 3.0 minutes and the optimum vulcanization time (T 90 ) was 30 minutes.
- T 10 induction time
- T 90 the optimum vulcanization time
- the above composition was subjected to press crosslinking (imidazole crosslinking) at 200 ° C. for 45 minutes, followed by postcrosslinking at 200 ° C. for 4 hours, then 260 ° C. for 5 hours, and further at 290 ° C. for 18 hours.
- a ring (AS-568A-214) was produced.
- the mechanical properties of the obtained cross-linked sheet were examined, the 100% modulus was 5.7 MPa, the tensile breaking strength was 21.6 MPa, the tensile breaking elongation was 240%, and the mechanical properties were excellent. I found out. Further, compression set was examined using an O-ring. The value after a 70-hour test at 260 ° C. was 89%.
- amine resistance In order to investigate amine resistance, it was immersed in ethylenediamine for 1 hour at room temperature, and then the strength characteristics were examined. The 100% modulus was 3.9 MPa, the tensile strength at break was 23.7 MPa, and the tensile elongation at break was It was 305%, and no deterioration was observed.
- the composition for vulcanization of the TFE-Pr copolymer produced in the examples was compression-molded by a hot press machine to form a sheet having a thickness of 2 mm according to JIS-K6251, 100% modulus, tensile breaking strength, The tensile elongation at break is measured.
- the test piece is dumbbell-shaped No. 4.
- Example 4 Crosslinking was carried out in the same manner as in Example 3 except that 1.75 parts by mass of 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (generic name: bisaminophenol AF) was used as the oxazole-based crosslinking agent.
- T 10 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane
- T 90 optimum vulcanization time
- Example 5 A crosslinkable composition was produced in the same manner as in Example 3 except that the TFE / Pr / CBVE copolymer obtained in Example 2 was used and 3.8 parts by mass of the crosslinking agent TA-AF was used. When the vulcanization characteristics were examined, the induction time (T 10 ) was 3.2 minutes and the optimum vulcanization time (T 90 ) was 36 minutes.
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Abstract
Description
(A)一般式(1):
ならびに
(B)請求項1~4のいずれかに記載の含フッ素エラストマー
を含む架橋性組成物に関する。
(I)VdFとヘキサフルオロプロピレン(HFP)またはVdFとHFPとTFEとを、好ましくはビニル基含有含フッ素反応性乳化剤および含フッ素イオン性乳化剤の共存下に乳化重合してVdF-HFP共重合体粒子またはVdF-HFP-TFE共重合体粒子を重合反応生成液1mlあたり1×1014個以上製造する工程(シードの製造工程)、および
(II)重合溶媒1mlあたり1×1014個以上のVdF-HFP共重合体粒子またはVdF-HFP-TFE共重合体粒子の存在下にTFEとPrとカルボキシル基含有ビニル単量体、さらに要すればVdFまたはPAVEとを乳化重合する工程
からなる。
CH2=CFCF2-[OCF(CF3)CF2]n1-(OCF2CF2CF2)n2-OCF(CF3)-COONH4
(式中、n1は0~10の整数;n2は0~10の整数)
で示される化合物が、種粒子の個数の増大効果が高い点から好ましい。
Rf-[OCF(CF3)CF2]m1-(OCF2CF2CF2)m2-OCF(CF3)-COOY1
(式中、Rfは炭素数1~6のパーフルオロアルキル基;Y1はH、-NH4またはアルカリ金属原子;m1は0~4の整数;m2は0~4の整数)
で示される化合物が、粒子の安定化効果、水への溶解性が良好な点から好ましい。
(A)一般式(1):
(B)本発明の含フッ素(TFE-Pr系)エラストマー
を含む。
で示される化合物が、合成が容易な点から好ましい。
測定装置:HONEYWELL社製のマイクロトラックUPA
測定方法:動的光散乱法
測定する乳濁液0.05mlを純水8mlで希釈して試料とし、室温にて測定を行う。得られたデータの個数平均径を粒子径とする。
計算方法:(1)で求めた平均粒子径と固形分含有量から、ポリマー比重を1.55として計算する。
測定装置:THERUMO Orion 720A、フッ素イオン選択電極
測定方法:試料約1.5mgを酸素ガス中で燃焼させ10mlの純水に吸収させ、10mlの緩衝液で中性とし、フッ素イオン選択電極で測定する。
測定装置:METLER TOLEDO社製のDSC822e
測定方法:試料約10mgを試料台にセットし、-50℃から150℃まで毎分10℃の速度で昇温し、吸熱の具合を記録して、比熱変化のあるところで接線を引き、中央点をTgとする。
測定装置:ALPHA TECHNOLOGIES 社製のMOONEY MV 2000E
測定方法:装置を121℃に設定し、測定試料約35gをLローターではさみ、1分余熱後測定を開始し、11分後(開始から10分後)の値をとる。
工程(I)
3リットルのステンレススチール製の攪拌機付きオートクレーブに純水1530ml、CH2=CFCF2OCF(CF3)CF2OCF(CF3)COONH4 0.153gおよびCF3CF2CF2OCF(CF3)CF2OCF(CF3)COONH4 3.06gを仕込み、系内を真空に引いた後チッ素ガスで充分に置換し、さらにHFPで置換した。系内温度80℃にて、イソペンタン0.04mlとHFPを仕込み、600rpmで攪拌しながらVdF/HFP(=65/35モル%)の単量体混合物を系内の内圧が1.5MPaとなるように圧入した。ついでAPS0.1gを5mlの純水に溶解した重合開始剤溶液をチッ素ガスで圧入し、反応を開始した。
3リットルのステンレススチール製の攪拌機付きオートクレーブに、工程(I)で得たpH調整された分散液(重合溶媒1mlあたり7.6×1014個のVdF-HFP共重合体粒子を含んでいる)765gとCH2=CFCF2OCF(CF3)CF2OCF(CF3)COONH4 0.765g、CF3CF2CF2OCF(CF3)CF2OCF(CF3)COONH4 1.53gおよび亜硫酸ナトリウム20gを仕込んだ後、系内を真空に引いた後チッ素ガスで充分に置換した。600rpmで攪拌しながら15℃にてTFE/Pr(=50.1/49.9モル%)の単量体混合物を2.2MPaになるまで圧入した。ついでAPS 0.5gを5mlの純水に溶解した重合開始剤溶液をチッ素ガスで圧入し、反応を開始した。
工程(I)
実施例1の工程(I)で得られたVdF-HFP共重合体粒子を含む重合反応生成液765gを、実施例1と同様にして使用した。
実施例1の工程(II)において、TFEとPrの重合の間に、マロン酸ジエチル1.8gを5回圧入し、かつCBVE 3.74gを18回圧入したほかは同様にして重合を行い、重合開始から323分後、追加単量体混合物量231gの時点で残存ガスを排出して重合を終了した。
実施例1で得られたTFE/Pr/CBVE共重合体100質量部に、カーボンブラックとしてN990(サーマックスMT(Cancarb製))20質量部、テトラアミン系架橋剤として2,2-ビス(3,4-ジアミノフェニル)ヘキサフルオロプロパン(架橋剤TA-AF)1.75質量部をオープンロールで混練し架橋用組成物を得た。この組成物の加硫特性を調べたところ、誘導時間(T10)は3.0分であり、最適加硫時間(T90)は30分であった。
実施例で製造したTFE-Pr共重合体の組成物を加硫する際に、JSR型キュラストメータV型を用いて200℃における加硫曲線を求め、誘導時間(T10)および最適加硫時間(T90)を求める。
実施例で製造したTFE-Pr共重合体の加硫用組成物を用いて、熱プレス機により圧縮成形し、厚さ2mmのシートとしJIS-K6251に準じて、100%モジュラス、引張破断強度、引張破断伸びを測定する。試験片は、ダンベル状4号形とする。
エチレンジアミンに室温にて1時間浸漬し、その後の強度特性を調べた。
オキサゾール系架橋剤として2,2-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン(一般名:ビスアミノフェノールAF)1.75質量部を使うこと以外は実施例3と同様にして架橋性組成物を製造し、加硫特性を調べたところ、誘導時間(T10)は5.0分であり、最適加硫時間(T90)は42.0分であった。
実施例2で得られたれたTFE/Pr/CBVE共重合体を使うことと、架橋剤TA-AFを3.8質量部を使うこと以外は実施例3と同様にして架橋性組成物を製造し、加硫特性を調べたところ、誘導時間(T10)は3.2分であり、最適加硫時間(T90)は36分であった。
Claims (8)
- テトラフルオロエチレン単位40~70モル%とプロピレン単位30~60モル%とカルボキシル基含有ビニル単量体単位0.1~2.5モル%からなり、121℃でのムーニー粘度が5~100である含フッ素エラストマー。
- 121℃でのムーニー粘度が10~80である請求項1記載の含フッ素エラストマー。
- カルボキシル基を側鎖に有する請求項1または2記載の含フッ素エラストマー。
- テトラフルオロエチレンとプロピレンとカルボキシル基含有ビニル単量体とを過酸化物、および必要に応じて還元剤の存在下に5~50℃の重合温度で共重合して得られる請求項1~3のいずれかに記載の含フッ素エラストマー。
- (A)一般式(1):
(式中、R1は、同じかまたは異なり、-NH2、-NHR2、-OHまたは-SHであり、R2は、フッ素原子または1価の有機基である)で示される架橋性反応基を少なくとも2個含む化合物、一般式(2):
で示される化合物、一般式(3):
(式中、Rf 1は炭素数1~10のパーフルオロアルキレン基)で示される化合物、および一般式(4):
(式中、nは1~10の整数)で示される化合物からなる群から選択される少なくとも1つの化合物、ならびに
(B)化合物(A)と架橋反応可能なテトラフルオロエチレン単位40~70モル%とプロピレン単位30~60モル%とカルボキシル基含有ビニル単量体単位0.1~2.5モル%からなり、121℃でのムーニー粘度が5~100である含フッ素エラストマーからなる含フッ素エラストマー組成物。 - 架橋剤(A)が、テトラアミン系架橋剤である請求項5記載の架橋性組成物。
- 含フッ素エラストマー(B)が、請求項1~4のいずれかに記載の含フッ素エラストマーを酸凝析して得られる含フッ素エラストマーである請求項6記載の架橋性組成物。
- 請求項5~7のいずれかに記載の架橋性組成物をイミダゾール架橋して得られる成形品。
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| JP2010505593A JP5429161B2 (ja) | 2008-03-25 | 2009-03-19 | 含フッ素エラストマーおよびそれを含む架橋性組成物 |
| US12/934,554 US8981009B2 (en) | 2008-03-25 | 2009-03-19 | Fluorine-containing elastomer and crosslinkable composition comprising same |
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| JP2008077663 | 2008-03-25 | ||
| JP2008-077663 | 2008-03-25 |
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| WO2009119439A1 true WO2009119439A1 (ja) | 2009-10-01 |
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ID=41113634
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| US (1) | US8981009B2 (ja) |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020080523A1 (ja) * | 2018-10-18 | 2020-04-23 | ダイキン工業株式会社 | 含フッ素エラストマー、架橋性組成物および成形品 |
| CN114644539A (zh) * | 2022-04-01 | 2022-06-21 | 安徽农业大学 | 一种含烯烃的二氟芳氧醚的合成方法及其在农药中的用途 |
| WO2022259629A1 (ja) * | 2021-06-09 | 2022-12-15 | 三菱電線工業株式会社 | 未架橋フッ素ゴム組成物並びにそれを用いて製造されるシール材及びその製造方法 |
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| WO2017195070A1 (en) | 2016-05-09 | 2017-11-16 | 3M Innovative Properties Company | Hydrofluoroolefins and methods of using same |
| EP3690000B1 (en) * | 2017-11-02 | 2024-02-07 | Daikin Industries, Ltd. | Fluorine-containing elastomer composition for heat dissipation material and sheet thereof |
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| JP7623608B2 (ja) | 2018-03-01 | 2025-01-29 | ダイキン工業株式会社 | フルオロポリマーの製造方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20110021716A1 (en) | 2011-01-27 |
| JP5429161B2 (ja) | 2014-02-26 |
| US8981009B2 (en) | 2015-03-17 |
| JPWO2009119439A1 (ja) | 2011-07-21 |
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